Stalling on veggie oil.

I just bought a used 1984 Ford Econoline with a veggie conversion. When I flip to veggie, it runs well for a few minutes, loses power, and stalls. If I flip back to diesel for just a couple seconds, then flip back, it regains power, runs well for 4-5 more minutes, loses power, and starts to stall, unless I flip back. I only need to flip back for a couple seconds, when I feel power return, and run back on veggie again for a few minutes. Bad oil?

Could be bad oil, as in

Could be bad oil, as in water/dirt in the oil, the oil might not be hot enough, or you might have a separate fuel filter for the SVO that might be old. But it could be many more things, but start with that first.

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